EP2014121B1 - Mode d'exploitation dans un système de communication à deux porteuses - Google Patents

Mode d'exploitation dans un système de communication à deux porteuses Download PDF

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Publication number
EP2014121B1
EP2014121B1 EP07733589.1A EP07733589A EP2014121B1 EP 2014121 B1 EP2014121 B1 EP 2014121B1 EP 07733589 A EP07733589 A EP 07733589A EP 2014121 B1 EP2014121 B1 EP 2014121B1
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EP
European Patent Office
Prior art keywords
cell
carrier
mobile device
network
receiver
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EP07733589.1A
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German (de)
English (en)
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EP2014121A1 (fr
Inventor
Simon Davis
Kenneth Isaacs
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HMD Global Oy
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HMD Global Oy
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H04W76/36—Selective release of ongoing connections for reassigning the resources associated with the released connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0009—Control or signalling for completing the hand-off for a plurality of users or terminals, e.g. group communication or moving wireless networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H04W36/28—Reselection being triggered by specific parameters by agreed or negotiated communication parameters involving a plurality of connections, e.g. multi-call or multi-bearer connections

Definitions

  • This invention relates to a method of operation in a dual carrier communication system, in particular for global system for mobile communications (GSM) systems, such as general packet radio service (GPRS) or voice group call systems.
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • voice group call systems such as voice group call systems.
  • the MS drops its GPRS connection in the old cell, reads system information in the new cell, sends access bursts to request resources in the new cell, and finally performs a cell update to indicate to a serving GPRS support node (SGSN) in the network that the MS has moved to the new cell.
  • SGSN serving GPRS support node
  • the SGSN redirects the downlink data flow to the MS.
  • a MS in group receive mode For voice group calls using voice group call service (VGCS) or voice broadcast service (VBS), a MS in group receive mode reads system information in a neighbouring cell in order to determine the position of a notification channel (NCH) and obtain some cell specific parameters such as the cell's identity which is needed to derive the ciphering keys. After cell reselection, the MS reads the NCH, if present, to find a location and description of the group, or broadcast channel for the particular group, or broadcast call. During this time the MS may not be able to listen to the downlink of the group, or broadcast channel in the new cell. Thus, there may be a noticeable interruption to the reception of speech on cell change. Additionally, the MS may miss the downlink signalling messages that are sent on the group, or broadcast channel.
  • NCH notification channel
  • These signalling messages can indicate the current status of the call (free or busy in VGCS only), the identity of the current talker (in VGCS only), new notifications (in both VGCS and VBS), or incoming short message service (SMS), either to the group or to the individual MS (applicable for both VGCS and VBS).
  • Uplink BUSY messages are typically transmitted every 5 seconds, so for VGCS, the MS may have to wait some time to determine the current status of the uplink.
  • PS handover procedures as defined for Release-6 of 3GPP GERAN standards, whereby resources are reserved in the target cell and core network signalling is used to prepare the target before the MS is commanded to handover to the target cell.
  • This has the best performance in terms of service interruption, but requires complex core network signalling and is wasteful of radio resources in the target cell, which are reserved, but not used for a period of time.
  • PS handover is aimed at being used for real-time PS services where the revenue is worth the cost of the procedure.
  • the document 3GPP TSG-RAN WG1 #42bis R1-051109 titled "Further description of WCDMA based E-UTRA" by Qualcomm discloses a multi-carrier operation for a mobile station.
  • the document WO 00/41429A describes the soft handoff of a mobile station. The mobile station uses both receivers to receive the signals of both frequencies f1 and f2. The two signals are isolated and then time and phase aligned to get combined to reinforce each of the two signals. Mobile station also transmits the same message in both frequencies to enable soft handoff uplink.
  • the document D2 describes the concept of communicating with 2 transceivers of the mobile station to one access point in Multiple-Input Multiple-Output configuration.
  • the present invention makes use of the ability of a dual carrier mobile to receive data from two cells at the same time, so that ongoing data transfer continues in the first cell, whilst the new cell is being set up.
  • the method further comprises transferring resources for communicating between the mobile device and the first cell to use only one carrier, in order to free up the second receiver; and accessing the second cell from the mobile device using the other carrier.
  • this transfer step can be omitted.
  • the mobile device accesses the second cell via the second carrier to carry out a cell reselection procedure, although there might be other situations where accessing more than one cell at one time is useful.
  • a cell reselection procedure for example, the use of dual carrier networks and mobile devices to receive the same MBMS (multi-media broadcast/multicast service) session from two cells at the same time in order to reduce the MBMS service interruption time on cell reselection.
  • MBMS multi-media broadcast/multicast service
  • the cell reselection procedure comprises, after the step of transferring resources from the second to the first carrier, continuing data exchange between the mobile device and the first cell on the first carrier; sending an uplink message to the second cell on the second carrier; switching downlink communication to the mobile via the second cell on the second carrier; and thereafter switching to uplink communication via the second cell on either carrier.
  • VGCS voice group call service
  • VBS voice broadcast service
  • Fig.1 illustrates a system operating in dual carrier mode, where cell reselection is required.
  • a dual carrier mobile device (MS) such as a laptop or mobile phone, communicates with an SGSN 2 of a mobile core network 3 via a base station (BSS-A) 4 of a first, or source, cell 5.
  • a dual carrier mobile has two receivers 6, 7, so it is able to receive on both channels at once, although the device is only provided with a single transmitter 8.
  • the dual receivers are used to enable the mobile to receive data from two different cells at the same time, enhancing the GPRS cell reselection procedure with little or no impact on the core network.
  • the mobile device chooses to move to a second, or target, cell 9 with a second base station (BSS-B) 10.
  • BSS-B second base station
  • BSS-A attempts to put all of the mobile's packet resources on to one carrier to free the mobile's second receiver up for receiving from the target cell parented by BSS-B. If this is not possible, then legacy procedures can be used for the cell reselection, or the network can choose to drop some of the data flows in order to free up the second receiver. In one embodiment, the BSS-A provides an acknowledgement to the mobile device, as to whether or not it can comply with the request to transfer resources.
  • the MS After reading 16 system or packet system information (SI/PSI) in the target cell 9 via the second receiver 7 of MS 1, or by using NACC procedures having obtained this information via the source cell 5, the MS switches its transmitter 8 to make access in the target cell 9 and establish some UL packet resources in the target cell, using the transmitter 8 and one receiver 7, at the same time that it is receiving data on the other receiver 6 via the source cell 5.
  • the MS may not be able to receive data in the source cell whilst the MS is transmitting in the target cell, but any lost data can be recovered, if needed, via the use of radio link control/medium access control (RLC/MAC) acknowledged mode when the transmitter is available again.
  • RLC/MAC radio link control/medium access control
  • the MS tunes its transmitter 8 to the target cell and starts sending UL LLC PDUs via the target cell and BSS-B 10 and drops radio resources in the source cell 5.
  • Alternative termination criteria could be set if desired.
  • the MS can ask BSS-B for more resources if required, which are allocated on 2 carriers in the downlink if necessary.
  • GPRS users benefit from a virtually seamless PS service in the downlink with low PS service interruption in the uplink for cell reselection, without needing RIM or O&M configuration for the operator, as in the case of network assisted cell change, nor is there unnecessary resource reservation in the target cell whilst waiting for the MS to access the target cell as in PS Handover.
  • the MS has had to wait before it can send uplink data via the new cell, there is no downlink delay because that continues in the old cell until the new connection is ready.
  • a voice group call may include users operating through several different cells and whilst the call is ongoing, one of the listeners using receiver 6 in cell 5 that is parented by BSS 4 may need to carry out cell reselection, as described above.
  • the listener needs to obtain system information messages from the broadcast control channel (BCCH) of the target cell that is parented by the target BSS in order to determine the position of the notification channel and determine some cell specific parameters.
  • the MS then must read the messages on the notification channel (NCH), once in the target cell, to determine the location of the group, or broadcast channel for that call. In the meantime, the user is unable to receive the data on the group channel.
  • BCCH broadcast control channel
  • NCH notification channel
  • Figs. 3 and 4 illustrate an example of VGCS/VBS using the present invention.
  • the MS 1 receives data 25 on a group channel 22 in a first cell 5 parented by BSS-A 4 at a first receiver 6 using a first carrier.
  • the MS also reads, using a second receiver 7 and second carrier, the system information on the BCCH and messages on the NCH of a second cell 9 parented by BSS-B 10.
  • Data is received 25 from a group channel 22 by first receiver 6 in the first cell 5, and system information on the BCCH 23 and messages on the NCH 23 from the second cell 9 are both received in messages 26 at the second receiver whilst the MS is still receiving the data in the first cell 5.
  • the MS is then able to receive 27 data from the group channel 24 of the second cell as soon as it moves to the second cell.

Claims (10)

  1. Procédé d'exploitation dans un système de communication à deux porteuses comprenant un dispositif mobile (1) communiquant avec un réseau (4, 10, 3) via des première et seconde porteuses ;
    le procédé comprenant :
    le transfert de ressources permettant la communication entre le dispositif mobile (1) et une première cellule (5) pour utiliser seulement une première ou une seconde porteuse, afin de libérer l'autre porteuse et l'accès à la seconde cellule (9) depuis le dispositif mobile (1) au moyen de l'autre porteuse ;
    la réception de données dans la première cellule (5) via l'une des première et seconde porteuses sur une fréquence porteuse, tout en recevant des informations système et/ou des données de liaison descendante provenant de la seconde cellule (9) via l'autre des première et seconde porteuses sur une autre fréquence porteuse.
  2. Procédé selon la revendication 1, dans lequel le dispositif mobile (1) comporte un émetteur (8) et des premier et second récepteurs (6, 7).
  3. Procédé selon l'une quelconque des revendications précédentes, dans lequel le dispositif mobile (1) accède à la seconde cellule (9) via la seconde porteuse pour effectuer une procédure de nouvelle sélection de cellule.
  4. Procédé selon la revendication 3, dans lequel la procédure de nouvelle sélection de cellule comprend, après l'étape de transfert de ressources de la seconde à la première porteuse, la poursuite de l'échange de données entre le dispositif mobile (1) et la première cellule (5) sur la première porteuse ; l'envoi d'un message de liaison montante à la seconde cellule (9) sur la seconde porteuse ; la commutation de la communication en liaison descendante vers le dispositif mobile (1) via la seconde cellule (9) sur la seconde porteuse ; et ensuite la commutation vers la communication en liaison montante via la seconde cellule (9) sur l'une ou l'autre des porteuses.
  5. Procédé selon la revendication 2, dans lequel le second récepteur (7) reçoit les informations système pour trouver l'emplacement d'un canal de notification et obtient certains paramètres propres à la cellule ; décode le canal de notification de la seconde cellule (9) pour déterminer si un appel de groupe est en cours ; et si un appel de groupe est en cours, détermine l'emplacement du canal de l'appel de groupe.
  6. Procédé selon la revendication 1, dans lequel dans une nouvelle sélection de cellule en mode à deux porteuses, le procédé comprend
    le transfert de ressources permettant la communication entre le dispositif mobile (1) et le réseau (4, 10, 3) via la première cellule (5) de deux porteuses vers une porteuse pour libérer l'autre porteuse ;
    le lancement d'une procédure de nouvelle sélection de cellule avec l'autre porteuse ;
    l'accès au réseau via la seconde cellule (9) ;
    dans le réseau, la commutation ainsi des données de liaison descendante dans le réseau (4, 10, 3) de la première cellule (5) vers la seconde cellule (9) ; et la commutation des données de liaison montante vers la seconde cellule (9).
  7. Procédé selon la revendication 1, dans lequel dans une nouvelle sélection de cellule en mode à deux porteuses dans un service d'appel de groupe vocal (VGCS) ou un service de diffusion vocale (VBS), le dispositif mobile (1) utilise un premier récepteur (6, 7) pour écouter un canal de groupe dans la première cellule (5), tout en utilisant un second récepteur (6, 7) pour obtenir des informations système dans la seconde cellule (9).
  8. Dispositif mobile MS (1) comprenant :
    un moyen (8, 6, 7) pour communiquer avec un réseau de communication à deux porteuses (4, 10, 3) via une première porteuse et une seconde porteuse,
    ledit moyen (8, 6, 7) étant configuré pour transférer des ressources permettant la communication entre le dispositif mobile (1) et une première cellule (5) pour utiliser seulement une première ou une seconde porteuse, afin de libérer l'autre porteuse et l'accès à la seconde cellule (9) depuis le dispositif mobile (1) au moyen de l'autre porteuse ;
    ledit moyen (8, 6, 7) étant configuré en outre pour recevoir des données dans la première cellule (5) via l'une des première et seconde porteuses sur une fréquence porteuse, tout en recevant des informations système provenant de la seconde cellule (9) via l'autre desdites première et seconde porteuses sur une autre fréquence porteuse.
  9. Dispositif mobile MS (1) selon la revendication 8, dans lequel ledit moyen de communication comprend un émetteur TX1 (8), un premier récepteur RX1 (6) et un second récepteur RX2 (7).
  10. Système de communication comprenant le dispositif mobile (1) selon la revendication 8 et un réseau (4, 10, 30, 3) adapté pour communiquer avec ledit dispositif mobile (1) dans le mode à deux porteuses pour des données en liaison descendante via la première et la seconde porteuse.
EP07733589.1A 2006-04-12 2007-03-29 Mode d'exploitation dans un système de communication à deux porteuses Active EP2014121B1 (fr)

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EP18200048.9A EP3445091A1 (fr) 2006-04-12 2007-03-29 Procédé de fonctionnement dans un système de communication à deux porteuses

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GB0607359A GB2437128B (en) 2006-04-12 2006-04-12 A Method Of Operation In A Dual Carrier Communication System
PCT/GB2007/050166 WO2007116227A1 (fr) 2006-04-12 2007-03-29 Mode d'exploitation dans un système de communication à deux porteuses

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EP2014121B1 true EP2014121B1 (fr) 2019-01-16

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CN (1) CN101455113A (fr)
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WO (1) WO2007116227A1 (fr)

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QUALCOMM EUROPE: "Further description of WCDMA based E-UTRA", 3GPP DRAFT; R1-051109, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. San Diego, USA; 20051004, 4 October 2005 (2005-10-04), XP050100724 *

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WO2007116227A1 (fr) 2007-10-18
EP3445091A1 (fr) 2019-02-20
EP2014121A1 (fr) 2009-01-14
US20090219871A1 (en) 2009-09-03
GB0607359D0 (en) 2006-05-24
GB2437128B (en) 2008-07-23
US10588172B2 (en) 2020-03-10
GB2437128A (en) 2007-10-17
CN101455113A (zh) 2009-06-10

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